EP1829177B1 - Spark plug - Google Patents

Spark plug Download PDF

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Publication number
EP1829177B1
EP1829177B1 EP05823951A EP05823951A EP1829177B1 EP 1829177 B1 EP1829177 B1 EP 1829177B1 EP 05823951 A EP05823951 A EP 05823951A EP 05823951 A EP05823951 A EP 05823951A EP 1829177 B1 EP1829177 B1 EP 1829177B1
Authority
EP
European Patent Office
Prior art keywords
axial core
spark
spark plug
electrode
circular hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05823951A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1829177A1 (en
Inventor
Nam-Pyong Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1829177A1 publication Critical patent/EP1829177A1/en
Application granted granted Critical
Publication of EP1829177B1 publication Critical patent/EP1829177B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs

Definitions

  • the present invention relates to a spark plug and in particular to an improved spark plug which is capable of significantly enhancing a spark spreading efficiency and a combustion efficiency when used in an engine.
  • a side surface ground electrode 12 of a spark plug 11 is bent in an L-shape like being perpendicular with respect to an axial core direction, so that a discharge cross section part 14 linearly facing an axial core electrode 13 is formed in a rectangular shape.
  • the carbon When residual carbon remains in the space formed by the electrodes, the carbon may be accumulated and be changed from a particle phase to a chain phase at the surfaces of the electrodes 13 and 14, so that a short circuit may occur between the electrodes 13 and 14. In this state, even when voltage is supplied, a spark may not occur, thereby producing serious problems, so that an engine may stop or mixed gas is outputted to an exhaust pipe in a state of not being combusted. As non-combusted gas is outputted to an exhaust pipe, a backfire phenomenon frequently occurs, so that an abnormal phenomenon and a combustion efficiency decrease problem occur.
  • a crack may occur at a discharge concentration portion of the front end of the axial core electrode 13 due to corrosion, so that critical damage occurs.
  • the life span of the spark plug may decrease due to an unbalanced abrasion.
  • a spark plug 26 which includes an axial core electrode 21 adapted to make a spark, and a side surface ground electrode 25 which is opposite to the axial core electrode 21 with the side surface ground electrode 25 being disposed with a spark space 22 from the axial core electrode 21, and with a discharge end part 23 of the side surface ground electrode 25 being formed in a circular shape and having a center circular hole 24.
  • a gap 27 of which part is opened is formed at the circular discharge end part 23 of the spark plug 26, and a plurality of protrusions 28 are formed at a circular inner side surface of the circular discharge front end part 23 in a circular shape.
  • the side surface ground electrode 25 is designed to effectively spread heat energy occurring during a spark and explosion combustion from the circular discharge end part 23, so that the area of the spark generation may increase.
  • the spark plug having the circular discharge end part 23 is known to slightly prevent the problem that carbon is accumulated on the surfaces of the electrodes.
  • the compressed mixed gas in the spark space 22 between the electrodes 21 and 25 is not uniformly distributed, the spark spreading speed and combustion efficiencies significantly decrease.
  • the above problems occur because the sparks occurring at the spark plug do not affect the uniformly distributed mixed gas.
  • the protrusions 28 formed at the inner side of the circular discharge end part 23 are formed with simple structures, so that the accumulated carbon can not be effectively removed from the surfaces of the electrodes because the sparks are spread in a straight line shape.
  • the document US 5,969,466 describes a spark plug including a ground electrode and a centre electrode.
  • the ground electrode comprises a ring-shaped member which is centred on the centre electrode.
  • a bevelled ring-shaped surface of the ring-shaped member generally faces the centre electrode. This increases the spark area of the ground electrode, providing for more consistent and stronger sparks, and even multiple sparks.
  • a cross-shaped channel is disposed centrally on a distal face of the centre electrode. Because of the increased spark area which the channel provides, the spark is more likely to travel along the channel, rather than jump from point to point along the distal face of the centre electrode, as can happen with conventional spark plugs, thus, the channel provides a stronger and more consistent spark.
  • the ground electrode has a conventional cantilever shape, but the centre electrode extends into coplanar relation to a distal surface of the electrode so that sparks propagate from the cylindrical side walls of the centre electrode.
  • the number of cantilevered ground electrodes is increased, with the ground electrodes being circumferentially and equidistantly spaced about the centre electrode.
  • the ground electrode has an annular configuration and includes a cylindrical annular wall spaced radially outwardly of the cylindrical sidewall of the centre electrode, in concentric relation to the centre electrode.
  • Variations of the second embodiment include screw threads, knurls, and various projections formed on the ground electrode, the centre electrode, or both.
  • a combustion efficiency is largely improved based on an enhanced explosion force, so that the removal of carbon from the electrodes is effective, and the center electrodes are uniformly worn out.
  • the center circular hole is tapered with the diameter of the center circular hole being increased in the direction of a lower side of the same.
  • the diameter of an upper side of the center circular hole is about 2/3 of the diameter of the axial core electrode.
  • Figure 1 is an enlarged front cross sectional view illustrating an electrode of a spark plug according to the present invention
  • Figure 2 is a bottom view illustrating a ground electrode of a side surface of a spark plug according to the present invention.
  • Protrusions 3 are formed at a lower surface of an axial core electrode 2 of a spark plug 1 and are protruded like a construction that small sand particles are protruded based on a knurling cutting process so as to enhance a discharge effect.
  • a circular part 6 is formed at a discharge end part of a side surface ground electrode 4 installed at a lower side of the axial core electrode 2 and includes a center circular hole 5 like surrounding a space meeting with an extended line of the axial core electrode 2. The discharge ends of the axial core electrode 2 and the side surface ground electrode 4 are distanced with respect to a spark forming space 9.
  • the diameter of the center circular hole 5 of the circular part 6 is slightly smaller than the diameter of the axial core electrode 2.
  • the center circular hole 5 has the same diameter with respect to the entire wall thickness, but it is preferably formed in a shape of a tapered horn-shaped hole.
  • the center circular hole 5 is formed in a tapered hole shape of which an upper portion (contacting with a spark forming space) formed at the side of the axial core electrode 2 has a small diameter part (d1), and the diameter increases in the direction of the lower side (combustion chamber side), so that a large diameter part (d2) is formed at the lower surface.
  • a plurality of spiral protrusions 7 are protruded from the tapered surface T of the inner side of the center circular hole 5 and have twisted shapes like the blades of an electric fan mounted on a wall of a building.
  • the small diameter part (d1) of the tapered center circular hole 5 is about 2/3 of the diameter (D) of the axial core electrode 2.
  • the small diameter part (d1) is smaller than the axial core electrode 2 so as to allow the axial core electrode 2 to generate a spark so that the spark is collided with a discharge surface 8 for thereby improving a shape of discharge.
  • the gas compressed during a compression stroke of an engine is inputted into the side of the spark plug 1 which corresponds to the upper side of the combustion chamber.
  • the mixed compression gas is guided by the tapered center circular hole 5 and is more compressed and collided with the spiral protrusions 7 for thereby generating a turbulent flow and flows into the spark forming space 9 between the electrodes 2 and 4.
  • the carbon accumulated at the spiral protrusions 7, the tapered surface T of the center circular hole 5 and the discharge surface 8 can be easily removed by the turbulent phenomenon of the mixer and the combustion gas which strongly occur during the explosion by the compression and spark.
  • a circular part having a center circular hole is formed at the discharge end part of the side surface ground electrode which is opposite to the axial core electrode, and a plurality of spiral protrusions are protruded from the inner surface of the circular part in the direction of the center circular hole, so that the compressed gas flows in a turbulent shape and is inputted into the spark forming space, so that the gas is uniformly mixed and is changed to micro-sized particles, whereby a spark spreading efficiency is enhanced, and a perfect combustion is achieved for thereby significantly improving a combustion effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP05823951A 2004-12-06 2005-11-23 Spark plug Not-in-force EP1829177B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020040101623A KR100674641B1 (ko) 2004-12-06 2004-12-06 점화 플러그
PCT/KR2005/003964 WO2006062302A1 (en) 2004-12-06 2005-11-23 Spark plug

Publications (2)

Publication Number Publication Date
EP1829177A1 EP1829177A1 (en) 2007-09-05
EP1829177B1 true EP1829177B1 (en) 2009-11-18

Family

ID=36578095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05823951A Not-in-force EP1829177B1 (en) 2004-12-06 2005-11-23 Spark plug

Country Status (12)

Country Link
US (1) US7687980B2 (ko)
EP (1) EP1829177B1 (ko)
JP (1) JP2008523547A (ko)
KR (1) KR100674641B1 (ko)
CN (1) CN101061612B (ko)
AT (1) ATE449443T1 (ko)
BR (1) BRPI0518100A (ko)
CA (1) CA2591328A1 (ko)
DE (1) DE602005017820D1 (ko)
MX (1) MX2007006666A (ko)
RU (1) RU2356145C2 (ko)
WO (1) WO2006062302A1 (ko)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100812345B1 (ko) * 2006-03-08 2008-03-11 삼성코닝정밀유리 주식회사 디스플레이 필터 및 이를 포함하는 디스플레이 장치
CN2909640Y (zh) * 2006-04-29 2007-06-06 汪亚豊 增强混合油气均匀度的火花塞
KR100881004B1 (ko) * 2006-09-26 2009-02-03 김창수 내연기관의 연소효율을 높이기 위한 와류발생장치를 가지는점화플러그
CN101471543B (zh) * 2007-12-28 2011-10-26 李忠尧 一种火花引导装置
JP2009216286A (ja) * 2008-03-10 2009-09-24 Panasonic Corp 空気調和機
US20110241521A1 (en) * 2010-03-30 2011-10-06 Denso International America, Inc. Spark plug electrode and method of manufacture
CN102299486A (zh) * 2011-05-30 2011-12-28 郑霞 多尖端火花塞
CN102611005B (zh) * 2012-04-16 2015-08-26 张蝶儿 一种火花塞及其接地电极
JP6299515B2 (ja) 2014-08-05 2018-03-28 株式会社デンソー 内燃機関用のスパークプラグ
DE102017102128B4 (de) 2016-02-18 2019-01-24 Federal-Mogul Ignition Gmbh Zündkerze für eine gasbetriebene Brennkraftmaschine
WO2020068967A1 (en) * 2018-09-26 2020-04-02 Cummins Inc. Spark plug configurations for a combustion pre-chamber of an internal combustion engine
US10615576B1 (en) 2019-04-02 2020-04-07 Caterpillar Inc. Spark plug

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57162282A (en) * 1981-03-30 1982-10-06 Otsuka Osamu Engine plug
US5430346A (en) * 1989-10-13 1995-07-04 Ultra Performance International, Inc. Spark plug with a ground electrode concentrically disposed to a central electrode and having precious metal on firing surfaces
JPH04319282A (ja) * 1991-04-16 1992-11-10 Shumei Baba スパークプラグ
FR2731848B1 (fr) * 1995-03-17 1997-04-18 Ader Bernard Electrode de masse annulaire pour bougie d'allumage
CN2236703Y (zh) * 1995-11-23 1996-10-02 陈亚林 可解式火花塞
US5892319A (en) * 1996-01-04 1999-04-06 Rossi; Paul Top and side firing spark plug
JPH09232066A (ja) * 1996-02-27 1997-09-05 Harumitsu Matsushita 点火プラグ
KR100199419B1 (ko) * 1996-09-16 1999-06-15 정몽규 혼합기의 유동성 증대를 위한 점화 플러그
US6013973A (en) * 1997-10-24 2000-01-11 Sato; Jun Spark plug having a sub-combustion chamber for use in fuel ignition systems
US5969466A (en) * 1998-06-11 1999-10-19 Dibianca; John Performance spark plug
KR100300913B1 (ko) * 1999-06-15 2001-11-01 이계안 점화 플러그
FR2797721B1 (fr) * 1999-08-18 2001-10-19 Daniel Drecq Bougie d'allumage equipee d'un capteur de pression, et moteur thermique equipe de telles bougies
CN2512137Y (zh) * 2001-11-29 2002-09-18 张琦 齿侧电极火花塞
CN2513266Y (zh) * 2001-12-20 2002-09-25 张琦 环齿状多极火花塞

Also Published As

Publication number Publication date
CA2591328A1 (en) 2006-06-15
EP1829177A1 (en) 2007-09-05
US20080088216A1 (en) 2008-04-17
RU2007118807A (ru) 2009-01-20
CN101061612A (zh) 2007-10-24
DE602005017820D1 (de) 2009-12-31
WO2006062302A1 (en) 2006-06-15
JP2008523547A (ja) 2008-07-03
CN101061612B (zh) 2012-05-30
KR100674641B1 (ko) 2007-01-26
RU2356145C2 (ru) 2009-05-20
US7687980B2 (en) 2010-03-30
KR20060062690A (ko) 2006-06-12
BRPI0518100A (pt) 2008-10-28
MX2007006666A (es) 2007-07-25
ATE449443T1 (de) 2009-12-15

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